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目前广泛采用的真空退火,可减少钛合金内氢含量和改善其使用性能。当氢含量低于0.005%时,Ti-6Al-41合金锻件的断裂韧性(K_(1c))显著提高。氢含量为0.002—0.005%时抗张强度临界系数降低0.3—0.4倍(图1);而当氢的浓度大时则几乎保持不变。氢的浓度很低时,某些钛合金对腐蚀裂纹的敏感性增加。这样,对氢含量为0.001%和0.004%的Ti-6Al-4V合金在Nacl溶液中作试验,得出的Kiscc值分别为276和230公斤/毫米3/2。
Currently widely used vacuum annealing, can reduce the hydrogen content of titanium alloys and improve its performance. When the hydrogen content is less than 0.005%, the fracture toughness (K_ (1c)) of Ti-6Al-41 alloy forging is significantly increased. When the hydrogen content is 0.002-0.005%, the critical value of tensile strength decreases by 0.3-0.4 times (Fig. 1). When the hydrogen concentration is large, the tensile strength almost remains unchanged. At low hydrogen concentrations, some titanium alloys have increased susceptibility to corrosion cracking. Thus, testing of Ti-6Al-4V alloys with 0.001% and 0.004% hydrogen content in Nacl solution gave Kiscc values of 276 and 230 kg / mm 3/2, respectively.